I just acetone soaked 3 Walkers in this teacup overnight. The acetone evaporated and this is what's left. Is this PVC residue? Oh and just so it's clear, this teacup was clean when I started!
Technically, it is a copper salt from your PVC. However, if you left the coins in there while it was evaporating, that means that same material is left on your coins and you will need to rinse you coins off in acetone again.
Even if he took the coins out of the acetone before it evaporated - he needs to do it again. That residue was in solution in the acetone before it evaporated, so some of it is still on those coins. That's why it is so important to use 3 containers of clean acetone, for each individual coin, when you do this.
Interesting. Actually I removed the coins from the acetone, rinsed them off and patted them dry. Then I let the rest of the acetone evaporate.
I am not sure Doug does, but several others here definitely do. You are using the acetone as a rinse and then you don't even need to "pat them dry".
Scott - Here are 3 links to threads that should answer all of your questions - http://www.cointalk.com/t193708/ http://www.cointalk.com/t193541/ http://www.cointalk.com/t193183/ If they don't answer all of your questions, then do an Advanced Search of the Coin Chat section. Open the Advanced Search window. Put the word "acetone" in as your key word. Put my name - GDJMSP - in the User Name box. Then hit your Enter key. That will bring up a long list of threads that will cover pretty much any situation there is, and it will include all the various points of view that others may have that differ from my point of view.
It might be PVC, it might be just dirt, and if they were circulated part of it is almost certainly old skin oils and possibly some old proteins and salts left from sweat.
